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<title>GstAppSrc: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<a name="gst-plugins-base-libs-appsrc"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-appsrc.top_of_page"></a>GstAppSrc</span></h2>
<p>GstAppSrc — Easy way for applications to inject buffers into a
    pipeline</p>
</td>
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</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-caps" title="gst_app_src_set_caps ()">gst_app_src_set_caps</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="returnvalue">GstCaps</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-caps" title="gst_app_src_get_caps ()">gst_app_src_get_caps</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-latency" title="gst_app_src_get_latency ()">gst_app_src_get_latency</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-latency" title="gst_app_src_set_latency ()">gst_app_src_set_latency</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-size" title="gst_app_src_set_size ()">gst_app_src_set_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-size" title="gst_app_src_get_size ()">gst_app_src_get_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-duration" title="gst_app_src_set_duration ()">gst_app_src_set_duration</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-duration" title="gst_app_src_get_duration ()">gst_app_src_get_duration</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-stream-type" title="gst_app_src_set_stream_type ()">gst_app_src_set_stream_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="returnvalue">GstAppStreamType</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-stream-type" title="gst_app_src_get_stream_type ()">gst_app_src_get_stream_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-max-bytes" title="gst_app_src_set_max_bytes ()">gst_app_src_set_max_bytes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-max-bytes" title="gst_app_src_get_max_bytes ()">gst_app_src_get_max_bytes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-current-level-bytes" title="gst_app_src_get_current_level_bytes ()">gst_app_src_get_current_level_bytes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-emit-signals" title="gst_app_src_get_emit_signals ()">gst_app_src_get_emit_signals</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-emit-signals" title="gst_app_src_set_emit_signals ()">gst_app_src_set_emit_signals</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-callbacks" title="gst_app_src_set_callbacks ()">gst_app_src_set_callbacks</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-push-buffer" title="gst_app_src_push_buffer ()">gst_app_src_push_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-push-buffer-list" title="gst_app_src_push_buffer_list ()">gst_app_src_push_buffer_list</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-push-sample" title="gst_app_src_push_sample ()">gst_app_src_push_sample</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-end-of-stream" title="gst_app_src_end_of_stream ()">gst_app_src_end_of_stream</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--block" title="The “block” property">block</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--caps" title="The “caps” property">caps</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--current-level-bytes" title="The “current-level-bytes” property">current-level-bytes</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--duration" title="The “duration” property">duration</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--emit-signals" title="The “emit-signals” property">emit-signals</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--format" title="The “format” property">format</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--is-live" title="The “is-live” property">is-live</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--max-bytes" title="The “max-bytes” property">max-bytes</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--max-latency" title="The “max-latency” property">max-latency</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--min-latency" title="The “min-latency” property">min-latency</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--min-percent" title="The “min-percent” property">min-percent</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--size" title="The “size” property">size</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="type">GstAppStreamType</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc--stream-type" title="The “stream-type” property">stream-type</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-end-of-stream" title="The “end-of-stream” signal">end-of-stream</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-enough-data" title="The “enough-data” signal">enough-data</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-need-data" title="The “need-data” signal">need-data</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-push-buffer" title="The “push-buffer” signal">push-buffer</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-push-buffer-list" title="The “push-buffer-list” signal">push-buffer-list</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-push-sample" title="The “push-sample” signal">push-sample</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></td>
</tr>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc-seek-data" title="The “seek-data” signal">seek-data</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAppSrc"></a><div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType">GstAppStreamType</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrcCallbacks" title="GstAppSrcCallbacks">GstAppSrcCallbacks</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-Enumeration-and-Flag-Types.html">GEnum</a>
    <span class="lineart">╰──</span> GstAppStreamType
    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSrc.html#GstBaseSrc-struct">GstBaseSrc</a>
                    <span class="lineart">╰──</span> GstAppSrc
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/app/app.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.description"></a><h2>Description</h2>
<p>The appsrc element can be used by applications to insert data into a
GStreamer pipeline. Unlike most GStreamer elements, appsrc provides
external API functions.</p>
<p>appsrc can be used by linking with the libgstapp library to access the
methods directly or by using the appsrc action signals.</p>
<p>Before operating appsrc, the caps property must be set to fixed caps
describing the format of the data that will be pushed with appsrc. An
exception to this is when pushing buffers with unknown caps, in which case no
caps should be set. This is typically true of file-like sources that push raw
byte buffers. If you don't want to explicitly set the caps, you can use
gst_app_src_push_sample. This method gets the caps associated with the
sample and sets them on the appsrc replacing any previously set caps (if
different from sample's caps).</p>
<p>The main way of handing data to the appsrc element is by calling the
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-push-buffer" title="gst_app_src_push_buffer ()"><code class="function">gst_app_src_push_buffer()</code></a> method or by emitting the push-buffer action signal.
This will put the buffer onto a queue from which appsrc will read from in its
streaming thread. It is important to note that data transport will not happen
from the thread that performed the push-buffer call.</p>
<p>The "max-bytes" property controls how much data can be queued in appsrc
before appsrc considers the queue full. A filled internal queue will always
signal the "enough-data" signal, which signals the application that it should
stop pushing data into appsrc. The "block" property will cause appsrc to
block the push-buffer method until free data becomes available again.</p>
<p>When the internal queue is running out of data, the "need-data" signal is
emitted, which signals the application that it should start pushing more data
into appsrc.</p>
<p>In addition to the "need-data" and "enough-data" signals, appsrc can emit the
"seek-data" signal when the "stream-mode" property is set to "seekable" or
"random-access". The signal argument will contain the new desired position in
the stream expressed in the unit set with the "format" property. After
receiving the seek-data signal, the application should push-buffers from the
new position.</p>
<p>These signals allow the application to operate the appsrc in two different
ways:</p>
<p>The push mode, in which the application repeatedly calls the push-buffer/push-sample
method with a new buffer/sample. Optionally, the queue size in the appsrc
can be controlled with the enough-data and need-data signals by respectively
stopping/starting the push-buffer/push-sample calls. This is a typical
mode of operation for the stream-type "stream" and "seekable". Use this
mode when implementing various network protocols or hardware devices.</p>
<p>The pull mode, in which the need-data signal triggers the next push-buffer call.
This mode is typically used in the "random-access" stream-type. Use this
mode for file access or other randomly accessable sources. In this mode, a
buffer of exactly the amount of bytes given by the need-data signal should be
pushed into appsrc.</p>
<p>In all modes, the size property on appsrc should contain the total stream
size in bytes. Setting this property is mandatory in the random-access mode.
For the stream and seekable modes, setting this property is optional but
recommended.</p>
<p>When the application has finished pushing data into appsrc, it should call
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-end-of-stream" title="gst_app_src_end_of_stream ()"><code class="function">gst_app_src_end_of_stream()</code></a> or emit the end-of-stream action signal. After
this call, no more buffers can be pushed into appsrc until a flushing seek
occurs or the state of the appsrc has gone through READY.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-app-src-set-caps"></a><h3>gst_app_src_set_caps ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_caps (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                      <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>Set the capabilities on the appsrc element.  This function takes
a copy of the caps structure. After calling this method, the source will
only produce caps that match <em class="parameter"><code>caps</code></em>
. <em class="parameter"><code>caps</code></em>
 must be fixed and the caps on the
buffers must match the caps or left NULL.</p>
<div class="refsect3">
<a name="gst-app-src-set-caps.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>caps to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-caps"></a><h3>gst_app_src_get_caps ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="returnvalue">GstCaps</span></a> *
gst_app_src_get_caps (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Get the configured caps on <em class="parameter"><code>appsrc</code></em>
.</p>
<div class="refsect3">
<a name="gst-app-src-get-caps.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-caps.returns"></a><h4>Returns</h4>
<p> the <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> produced by the source. <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#gst-caps-unref"><code class="function">gst_caps_unref()</code></a> after usage.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-latency"></a><h3>gst_app_src_get_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_get_latency (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *min</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *max</code></em>);</pre>
<p>Retrieve the min and max latencies in <em class="parameter"><code>min</code></em>
 and <em class="parameter"><code>max</code></em>
 respectively.</p>
<div class="refsect3">
<a name="gst-app-src-get-latency.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min</p></td>
<td class="parameter_description"><p>the min latency. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p>the max latency. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-latency"></a><h3>gst_app_src_set_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_latency (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> min</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> max</code></em>);</pre>
<p>Configure the <em class="parameter"><code>min</code></em>
 and <em class="parameter"><code>max</code></em>
 latency in <em class="parameter"><code>src</code></em>
. If <em class="parameter"><code>min</code></em>
 is set to -1, the
default latency calculations for pseudo-live sources will be used.</p>
<div class="refsect3">
<a name="gst-app-src-set-latency.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min</p></td>
<td class="parameter_description"><p>the min latency</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p>the max latency</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-size"></a><h3>gst_app_src_set_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_size (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                      <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> size</code></em>);</pre>
<p>Set the size of the stream in bytes. A value of -1 means that the size is
not known.</p>
<div class="refsect3">
<a name="gst-app-src-set-size.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>the size to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-size"></a><h3>gst_app_src_get_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>
gst_app_src_get_size (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Get the size of the stream in bytes. A value of -1 means that the size is
not known.</p>
<div class="refsect3">
<a name="gst-app-src-get-size.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-size.returns"></a><h4>Returns</h4>
<p> the size of the stream previously set with <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-size" title="gst_app_src_set_size ()"><code class="function">gst_app_src_set_size()</code></a>;</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-duration"></a><h3>gst_app_src_set_duration ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_duration (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> duration</code></em>);</pre>
<p>Set the duration of the stream in nanoseconds. A value of GST_CLOCK_TIME_NONE means that the duration is
not known.</p>
<div class="refsect3">
<a name="gst-app-src-set-duration.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>duration</p></td>
<td class="parameter_description"><p>the duration to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix06.html#api-index-1.10">1.10</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-duration"></a><h3>gst_app_src_get_duration ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>
gst_app_src_get_duration (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Get the duration of the stream in nanoseconds. A value of GST_CLOCK_TIME_NONE means that the duration is
not known.</p>
<div class="refsect3">
<a name="gst-app-src-get-duration.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-duration.returns"></a><h4>Returns</h4>
<p> the duration of the stream previously set with <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-duration" title="gst_app_src_set_duration ()"><code class="function">gst_app_src_set_duration()</code></a>;</p>
</div>
<p class="since">Since: <a class="link" href="ix06.html#api-index-1.10">1.10</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-stream-type"></a><h3>gst_app_src_set_stream_type ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_stream_type (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                             <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="type">GstAppStreamType</span></a> type</code></em>);</pre>
<p>Set the stream type on <em class="parameter"><code>appsrc</code></em>
. For seekable streams, the "seek" signal must
be connected to.</p>
<p>A stream_type stream</p>
<div class="refsect3">
<a name="gst-app-src-set-stream-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>the new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-stream-type"></a><h3>gst_app_src_get_stream_type ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="returnvalue">GstAppStreamType</span></a>
gst_app_src_get_stream_type (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Get the stream type. Control the stream type of <em class="parameter"><code>appsrc</code></em>

with <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-stream-type" title="gst_app_src_set_stream_type ()"><code class="function">gst_app_src_set_stream_type()</code></a>.</p>
<div class="refsect3">
<a name="gst-app-src-get-stream-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-stream-type.returns"></a><h4>Returns</h4>
<p> the stream type.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-max-bytes"></a><h3>gst_app_src_set_max_bytes ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_max_bytes (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> max</code></em>);</pre>
<p>Set the maximum amount of bytes that can be queued in <em class="parameter"><code>appsrc</code></em>
.
After the maximum amount of bytes are queued, <em class="parameter"><code>appsrc</code></em>
 will emit the
"enough-data" signal.</p>
<div class="refsect3">
<a name="gst-app-src-set-max-bytes.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p>the maximum number of bytes to queue</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-max-bytes"></a><h3>gst_app_src_get_max_bytes ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>
gst_app_src_get_max_bytes (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Get the maximum amount of bytes that can be queued in <em class="parameter"><code>appsrc</code></em>
.</p>
<div class="refsect3">
<a name="gst-app-src-get-max-bytes.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-max-bytes.returns"></a><h4>Returns</h4>
<p> The maximum amount of bytes that can be queued.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-current-level-bytes"></a><h3>gst_app_src_get_current_level_bytes ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>
gst_app_src_get_current_level_bytes (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Get the number of currently queued bytes inside <em class="parameter"><code>appsrc</code></em>
.</p>
<div class="refsect3">
<a name="gst-app-src-get-current-level-bytes.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-current-level-bytes.returns"></a><h4>Returns</h4>
<p> The number of currently queued bytes.</p>
</div>
<p class="since">Since: <a class="link" href="ix14.html#api-index-1.2">1.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-get-emit-signals"></a><h3>gst_app_src_get_emit_signals ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_app_src_get_emit_signals (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Check if appsrc will emit the "new-preroll" and "new-buffer" signals.</p>
<div class="refsect3">
<a name="gst-app-src-get-emit-signals.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-get-emit-signals.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>appsrc</code></em>
is emitting the "new-preroll" and "new-buffer"
signals.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-emit-signals"></a><h3>gst_app_src_set_emit_signals ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_emit_signals (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> emit</code></em>);</pre>
<p>Make appsrc emit the "new-preroll" and "new-buffer" signals. This option is
by default disabled because signal emission is expensive and unneeded when
the application prefers to operate in pull mode.</p>
<div class="refsect3">
<a name="gst-app-src-set-emit-signals.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>emit</p></td>
<td class="parameter_description"><p>the new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-set-callbacks"></a><h3>gst_app_src_set_callbacks ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_src_set_callbacks (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                           <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrcCallbacks" title="GstAppSrcCallbacks"><span class="type">GstAppSrcCallbacks</span></a> *callbacks</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>Set callbacks which will be executed when data is needed, enough data has
been collected or when a seek should be performed.
This is an alternative to using the signals, it has lower overhead and is thus
less expensive, but also less flexible.</p>
<p>If callbacks are installed, no signals will be emitted for performance
reasons.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="gst-app-src-set-callbacks.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callbacks</p></td>
<td class="parameter_description"><p>the callbacks</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>a user_data argument for the callbacks</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>notify</p></td>
<td class="parameter_description"><p>a destroy notify function</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-push-buffer"></a><h3>gst_app_src_push_buffer ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_app_src_push_buffer (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Adds a buffer to the queue of buffers that the appsrc element will
push to its source pad.  This function takes ownership of the buffer.</p>
<p>When the block property is TRUE, this function can block until free
space becomes available in the queue.</p>
<div class="refsect3">
<a name="gst-app-src-push-buffer.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> to push. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-push-buffer.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> when the buffer was successfuly queued.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a> when <em class="parameter"><code>appsrc</code></em>
is not PAUSED or PLAYING.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-EOS:CAPS"><span class="type">GST_FLOW_EOS</span></a> when EOS occured.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-push-buffer-list"></a><h3>gst_app_src_push_buffer_list ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_app_src_push_buffer_list (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBufferList.html#GstBufferList-struct"><span class="type">GstBufferList</span></a> *buffer_list</code></em>);</pre>
<p>Adds a buffer list to the queue of buffers and buffer lists that the
appsrc element will push to its source pad.  This function takes ownership
of <em class="parameter"><code>buffer_list</code></em>
.</p>
<p>When the block property is TRUE, this function can block until free
space becomes available in the queue.</p>
<div class="refsect3">
<a name="gst-app-src-push-buffer-list.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer_list</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBufferList.html#GstBufferList-struct"><span class="type">GstBufferList</span></a> to push. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-push-buffer-list.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> when the buffer list was successfuly queued.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a> when <em class="parameter"><code>appsrc</code></em>
is not PAUSED or PLAYING.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-EOS:CAPS"><span class="type">GST_FLOW_EOS</span></a> when EOS occured.</p>
</div>
<p class="since">Since: <a class="link" href="ix04.html#api-index-1.14">1.14</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-push-sample"></a><h3>gst_app_src_push_sample ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_app_src_push_sample (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html#GstSample-struct"><span class="type">GstSample</span></a> *sample</code></em>);</pre>
<p>Extract a buffer from the provided sample and adds it to the queue of
buffers that the appsrc element will push to its source pad. Any
previous caps that were set on appsrc will be replaced by the caps
associated with the sample if not equal.</p>
<p>This function does not take ownership of the
sample so the sample needs to be unreffed after calling this function.</p>
<p>When the block property is TRUE, this function can block until free
space becomes available in the queue.</p>
<div class="refsect3">
<a name="gst-app-src-push-sample.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sample</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html#GstSample-struct"><span class="type">GstSample</span></a> from which buffer and caps may be
extracted. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-push-sample.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> when the buffer was successfuly queued.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a> when <em class="parameter"><code>appsrc</code></em>
is not PAUSED or PLAYING.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-EOS:CAPS"><span class="type">GST_FLOW_EOS</span></a> when EOS occured.</p>
</div>
<p class="since">Since: <a class="link" href="ix10.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-src-end-of-stream"></a><h3>gst_app_src_end_of_stream ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_app_src_end_of_stream (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
<p>Indicates to the appsrc element that the last buffer queued in the
element is the last buffer of the stream.</p>
<div class="refsect3">
<a name="gst-app-src-end-of-stream.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-app-src-end-of-stream.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> when the EOS was successfuly queued.
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a> when <em class="parameter"><code>appsrc</code></em>
is not PAUSED or PLAYING.</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAppStreamType"></a><h3>enum GstAppStreamType</h3>
<p>The stream type.</p>
<div class="refsect3">
<a name="GstAppStreamType.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-APP-STREAM-TYPE-STREAM:CAPS"></a>GST_APP_STREAM_TYPE_STREAM</p></td>
<td class="enum_member_description">
<p>No seeking is supported in the stream, such as a
live stream.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-APP-STREAM-TYPE-SEEKABLE:CAPS"></a>GST_APP_STREAM_TYPE_SEEKABLE</p></td>
<td class="enum_member_description">
<p>The stream is seekable but seeking might not
be very fast, such as data from a webserver.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-APP-STREAM-TYPE-RANDOM-ACCESS:CAPS"></a>GST_APP_STREAM_TYPE_RANDOM_ACCESS</p></td>
<td class="enum_member_description">
<p>The stream is seekable and seeking is fast,
such as in a local file.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrcCallbacks"></a><h3>GstAppSrcCallbacks</h3>
<pre class="programlisting">typedef struct {
  void      (*need_data)    (GstAppSrc *src, guint length, gpointer user_data);
  void      (*enough_data)  (GstAppSrc *src, gpointer user_data);
  gboolean  (*seek_data)    (GstAppSrc *src, guint64 offset, gpointer user_data);
} GstAppSrcCallbacks;
</pre>
<p>A set of callbacks that can be installed on the appsrc with
<a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-callbacks" title="gst_app_src_set_callbacks ()"><code class="function">gst_app_src_set_callbacks()</code></a>.</p>
<div class="refsect3">
<a name="GstAppSrcCallbacks.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAppSrcCallbacks.need-data"></a>need_data</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when the appsrc needs more data. A buffer or EOS should be
pushed to appsrc from this thread or another thread. <em class="parameter"><code>length</code></em>
is just a hint
and when it is set to -1, any number of bytes can be pushed into <em class="parameter"><code>appsrc</code></em>
.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAppSrcCallbacks.enough-data"></a>enough_data</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when appsrc has enough data. It is recommended that the
application stops calling push-buffer until the need_data callback is
emitted again to avoid excessive buffer queueing.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAppSrcCallbacks.seek-data"></a>seek_data</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when a seek should be performed to the offset.
The next push-buffer should produce buffers from the new <em class="parameter"><code>offset</code></em>
.
This callback is only called for seekable stream types.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAppSrc--block"></a><h3>The <code class="literal">“block”</code> property</h3>
<pre class="programlisting">  “block”                    <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Block push-buffer when max-bytes are queued.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--caps"></a><h3>The <code class="literal">“caps”</code> property</h3>
<pre class="programlisting">  “caps”                     <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</pre>
<p>The allowed caps for the src pad.</p>
<p>Flags: Read / Write</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--current-level-bytes"></a><h3>The <code class="literal">“current-level-bytes”</code> property</h3>
<pre class="programlisting">  “current-level-bytes”      <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>The number of currently queued bytes.</p>
<p>Flags: Read</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--duration"></a><h3>The <code class="literal">“duration”</code> property</h3>
<pre class="programlisting">  “duration”                 <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>The duration of the data stream in nanoseconds (GST_CLOCK_TIME_NONE if unknown).</p>
<p>Flags: Read / Write</p>
<p>Default value: 18446744073709551615</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--emit-signals"></a><h3>The <code class="literal">“emit-signals”</code> property</h3>
<pre class="programlisting">  “emit-signals”             <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Emit need-data, enough-data and seek-data signals.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--format"></a><h3>The <code class="literal">“format”</code> property</h3>
<pre class="programlisting">  “format”                   <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a></pre>
<p>The format of the segment events and seek.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_FORMAT_BYTES</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--is-live"></a><h3>The <code class="literal">“is-live”</code> property</h3>
<pre class="programlisting">  “is-live”                  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to act as a live source.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--max-bytes"></a><h3>The <code class="literal">“max-bytes”</code> property</h3>
<pre class="programlisting">  “max-bytes”                <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>The maximum number of bytes to queue internally (0 = unlimited).</p>
<p>Flags: Read / Write</p>
<p>Default value: 200000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--max-latency"></a><h3>The <code class="literal">“max-latency”</code> property</h3>
<pre class="programlisting">  “max-latency”              <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>The maximum latency (-1 = unlimited).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= -1</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--min-latency"></a><h3>The <code class="literal">“min-latency”</code> property</h3>
<pre class="programlisting">  “min-latency”              <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>The minimum latency (-1 = default).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= -1</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--min-percent"></a><h3>The <code class="literal">“min-percent”</code> property</h3>
<pre class="programlisting">  “min-percent”              <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Emit need-data when queued bytes drops below this percent of max-bytes.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &lt;= 100</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--size"></a><h3>The <code class="literal">“size”</code> property</h3>
<pre class="programlisting">  “size”                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>The size of the data stream in bytes (-1 if unknown).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= -1</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc--stream-type"></a><h3>The <code class="literal">“stream-type”</code> property</h3>
<pre class="programlisting">  “stream-type”              <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="type">GstAppStreamType</span></a></pre>
<p>the type of the stream.</p>
<p>Flags: Read / Write</p>
<p>Default value: GST_APP_STREAM_TYPE_STREAM</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstAppSrc-end-of-stream"></a><h3>The <code class="literal">“end-of-stream”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>   user_data)</pre>
<p>Notify <em class="parameter"><code>appsrc</code></em>
 that no more buffer are available.</p>
<div class="refsect3">
<a name="GstAppSrc-end-of-stream.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc-enough-data"></a><h3>The <code class="literal">“enough-data”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>   user_data)</pre>
<p>Signal that the source has enough data. It is recommended that the
application stops calling push-buffer until the need-data signal is
emitted again to avoid excessive buffer queueing.</p>
<div class="refsect3">
<a name="GstAppSrc-enough-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc element that emitted the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc-need-data"></a><h3>The <code class="literal">“need-data”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a>      length,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>   user_data)</pre>
<p>Signal that the source needs more data. In the callback or from another
thread you should call push-buffer or end-of-stream.</p>
<p><em class="parameter"><code>length</code></em>
 is just a hint and when it is set to -1, any number of bytes can be
pushed into <em class="parameter"><code>appsrc</code></em>
.</p>
<p>You can call push-buffer multiple times until the enough-data signal is
fired.</p>
<div class="refsect3">
<a name="GstAppSrc-need-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc element that emitted the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>the amount of bytes needed.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc-push-buffer"></a><h3>The <code class="literal">“push-buffer”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBuffer.html#GstBuffer-struct"><span class="type">GstBuffer</span></a> *buffer,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>   user_data)</pre>
<p>Adds a buffer to the queue of buffers that the appsrc element will
push to its source pad. This function does not take ownership of the
buffer so the buffer needs to be unreffed after calling this function.</p>
<p>When the block property is TRUE, this function can block until free space
becomes available in the queue.</p>
<div class="refsect3">
<a name="GstAppSrc-push-buffer.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer to push</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc-push-buffer-list"></a><h3>The <code class="literal">“push-buffer-list”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a>     *appsrc,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBufferList.html#GstBufferList-struct"><span class="type">GstBufferList</span></a> *buffer_list,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>       user_data)</pre>
<p>Adds a buffer list to the queue of buffers and buffer lists that the
appsrc element will push to its source pad. This function does not take
ownership of the buffer list so the buffer list needs to be unreffed
after calling this function.</p>
<p>When the block property is TRUE, this function can block until free space
becomes available in the queue.</p>
<div class="refsect3">
<a name="GstAppSrc-push-buffer-list.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer_list</p></td>
<td class="parameter_description"><p>a buffer list to push</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
<p class="since">Since: <a class="link" href="ix04.html#api-index-1.14">1.14</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc-push-sample"></a><h3>The <code class="literal">“push-sample”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html#GstSample-struct"><span class="type">GstSample</span></a> *sample,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>   user_data)</pre>
<p>Extract a buffer from the provided sample and adds the extracted buffer
to the queue of buffers that the appsrc element will
push to its source pad. This function set the appsrc caps based on the caps
in the sample and reset the caps if they change.
Only the caps and the buffer of the provided sample are used and not
for example the segment in the sample.
This function does not take ownership of the
sample so the sample needs to be unreffed after calling this function.</p>
<p>When the block property is TRUE, this function can block until free space
becomes available in the queue.</p>
<div class="refsect3">
<a name="GstAppSrc-push-sample.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sample</p></td>
<td class="parameter_description"><p>a sample from which extract buffer to push</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-ACTION:CAPS">Action</a></p>
<p class="since">Since: <a class="link" href="ix10.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstAppSrc-seek-data"></a><h3>The <code class="literal">“seek-data”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
user_function (<a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>    offset,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>   user_data)</pre>
<p>Seek to the given offset. The next push-buffer should produce buffers from
the new <em class="parameter"><code>offset</code></em>
.
This callback is only called for seekable stream types.</p>
<div class="refsect3">
<a name="GstAppSrc-seek-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsrc</p></td>
<td class="parameter_description"><p>the appsrc element that emitted the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>the offset to seek to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstAppSrc-seek-data.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the seek succeeded.</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsrc.see-also"></a><h2>See Also</h2>
<p><a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSrc.html#GstBaseSrc-struct"><span class="type">GstBaseSrc</span></a>, appsink</p>
</div>
</div>
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